Devonian Period

Devonian, which follows the Silurian period,
covers the time between 410 and 354 million years ago.

Devonian is
known for the first insects, the first seed-bearing plants and the
first tetrapods (four-legged animals).

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In Australia,
there was a final upheaval of land which pushed the ocean even further
east of the eastern coast than it was during Silurian.

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With that, the
times of marine depositions in inland eastern Australia had ended, and
a widespread erosion of the continent started.

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There were many volcanic
arcs in eastern Australia. The arcs of eastern Victoria,
New England's area and north
Queensland (between Charters
Towers and Chillagoe)
were mainly andesitic. Another, Calliope Arc, streched from north of
Rockhampton south to Crafton.

In Western
Australia,
the arm of the sea that sterched to inland during Silurian, had major
reefs and intertidal carbonate environments, limestones of which are
today seen in the Geikie and Windjana Gorges near Fritzroy Crossing in
the Kimberley.
Another phase of alluvial sedimentation in the area deposited the
sandstones that have been eroded into the bizarre hills of Bungle
Bungle Ranges.

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In the end of Devonian the climate started getting
colder as the Gondwana
continent was
entering another icehouse phace
during Carboniferous
and Permian
periods (Northern Hemisphere remained warmer).

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